Question

a school has 630students .the ratio of the number of boys to the girls is 3:2.the ratio changes to 7:5 after the addmission of 90 new students.find the number of newly admitted boys​

Answer 1

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Answer 2

Answer:

42

Step-by-step explanation:

No.of students=630

Ratio of boys to girls=3:2

3+2=5

630/5=126

No of boys=3*126

=378

No of students after admission=720(630+90)

Ratio of boys to girls=7:5

7+5=12

720/12=60

No of boys=7*60

= 420

Newly admitted boys= 420-378

= 42